[Live-devel] windows winsock error 10038

[Serge.Grondin at miranda.com]

Hi Ross and Andrey,

I got the exact same bug on my Linux server,  a random "bad file
descriptor" error that kills my server every 24 hours or so using RTP over
TCP streaming.  Hopefully I have an auto restart mechanism that respawn my
server but that's not really great solution.  Same thing for me, I have not
changed anything in the code and I don't even close or open any TCP socket
(and I don't play with background handling).  Last week I decided to take a
deeper look into it and I think I have found a track but I don't have a
good solution for it.  That thing is really hard to reproduce but I think
the best way to get it is to kill the client process listening to a TCP
stream connected to live555 server (and clients reuse the same source
flag).  On my server the problem seems to come when the connection between
the server and the client is lost while streaming TCP for a long time.

The problem I found is in RTPInterface.cpp file

-> SocketDescriptor::tcpReadHandler1 line 422
If readSocket fails (-1) it triggers a deletion of the SocketDescriptor
object

However this is leaving a dangling pointer in the HashTable in RTPInterface
(lookupSocketDescriptor) while the "OnDemandServerMediaSubsession" is still
alive.  Then a new client comes, RTPInterface::startNetworkReading is
called and "registerRTPInterface" is called again on the dead
SocketDescriptor, registering the dead socket for background handling...
boom!
You get the file descriptor error and the server dies.

I found it by adding a few "printf" in this area, I suggest you should do
the same.  I don't have a clear idea how to fix that but I'm happy I'm not
the only one getting it.

Thanks!


Serge Grondin
Miranda Technnologies




From:	Ross Finlayson <finlayson at live555.com>
To:	LIVE555 Streaming Media - development & use
            <live-devel at ns.live555.com>,
Date:	2013-06-18 04:18
Subject:	Re: [Live-devel] windows winsock error 10038
Sent by:	live-devel-bounces at ns.live555.com



      Thanks for the quick reply. However, the error occurs even if the
      test code testOnDemandRTSPServer reuseFirstSource set to True. I have
      not changed anything in the code, except the reuseFirstSource.

If that's the case, then unfortunately you're going to have to track down
the specific problem in our code that is causing this - because nobody else
has reported seeing this issue.

(As always, I assume that you're using the latest version of the LIVE555
software - the only version that we support.)


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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